Ladder-clamp.



P. E. .BGHNSUW & E. ANDERSON.

LADDER CLAMP.

APPLICATIOS! FILED AUGJO. 1918.

1 1 2 Patent fiept. 25, 191?.

WITNESSES PEER EDWARD JOHNSON AND EDWARD ANDERSON, OF BROOKLYN, NEWYORK.

LADDER-CLAMP.

1 241,392. Specification of Letters Patent.

Patented Sept. 25, 1917.

Application filed August 10, 1916. Serial No. 114,158.

' United States, and residents of the city of New York, borough ofBrooklyn, in the county of Kings and State of New York,-.

' have invented a new and Improved Ladder Clamp, of which" the followingis a full,

clear, and exact description.

. This invention relates to ladders and par ticularly to clamps. forproviding an exten sion or for a connecting of two or moreladderstogether, and has for an object the provision of an improvedarrangement which .may be quickly applied and quickly 'removed and whilein place. will rigidly hold the parts together.

Another object in view-is to provide a clamp of a substantiallyU-sha'ped structure with a bracing extension and a clamping memberarranged to be moved'out of the way when applying the U-shaped member.

In the accompanying drawing Figure 1 is a perspective view of the lowerpart of a ladder with a short extension clamped thereto, an embodimentof the invention being shown in connection therewith. I

Fig. 2 is a perspective view of a clamp embodying the invention.

Fig. 3 is a longitudinal vertical section through a clamp disclosing anembodiment of. the invention, the same being on a slightly enlargedscale.

Referring to the accompanying drawing by numerals, 1 indicates a ladderof any suitable construction provided with the rungs 2, and 3 indicatesan extension ladder provided with rungs 4. If desired the rungs 4: maybe omitted as these members form no part of the present invention. The

, invention is comprised in the various clamps 5, all of which are ofidentical construction but arranged so that the clamps on one side willengage the under surface of the rungs 2 while the clamps on the oppositeside will engage the upper surface.

The various clamps 5 are made as shown in detail in Figs. 2 and 3, inwhich it will be observed there is provided a U-shaped member 6 formedwith a backsection 7 and end sections 8 and 9, said .back section andpart of the.end sections being provided with a reinforcing rib 10. Theend section 9 is provided with an enlargement 11 merging is rotatablintorib 10, said enlargement being formed with a hollowed-out portion12, as shown in Fig. 3, for accommodating the cup 13 which screw passingthrough a threaded aperture in the enlargement 11. The cup or foot 13 ispreferably roughened so as to not readily sli when the clamp is beingused.

The end section 8 is provided with an enlargement 16 forming a halftubular member which is designed to partially surround the various rungs2-when the clamp is in use. This enlargement assists in hold-' ing theclamp in proper position and also by acting on the rungs stiffens theladder at the point where the clamp is located. A

groove 17 is also preferably made on the outer surface of theenlargement 16, which groove may be used for receiving a wire or otherclamping means passed around the enlargement 16 and around one of therungs whereby'the clamping member is tied in position. This tying membermay be used or not, as preferred.

In forming the clam s they are'preferably all made identical inconstruction and clamp for binding said sections together at the partthat overlaps, said clamp comprising a spanning body for spanning saidsections, a clamping screw arranged on one part of said body adapted topress against one of said sections and draw the opposite section againstthe first mentioned section,

mounted on a screw 14, said.

and a bracing extension shaped to partly surround one of the rungs ofone of said sections for preventing independent movement of said lastmentioned section in respect to said clamp.

PHER EDWARD JOHNSON. EDWARD ANDERSON. I-n presence of H. J. SoHRonDER,WM. J. SOHROEDER.

